[proto] add rooms and slots

src/common/proto/core.proto

@@ -7,23 +7,9 @@ message UserProto {
     string name = 2;
 }
 
-enum GameStateProto {
-    READY = 0;
-    STARTED = 1;
-    ENDED = 2;
-}
-
-message PlayerProto {
-    UserProto user = 1;
-    string team = 2;
-    int32 index = 3;
-}
-
 message GameProto {
     int32 id = 1;
     string type = 2;
     int32 level = 3;
-    UserProto creator = 4;
-    repeated PlayerProto players = 5;
-    GameStateProto state = 6;
+    bool started = 4;
 }